/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.metrics.metricsets.jvm;

import org.apache.iotdb.metrics.AbstractMetricService;
import org.apache.iotdb.metrics.metricsets.IMetricSet;
import org.apache.iotdb.metrics.utils.MetricLevel;
import org.apache.iotdb.metrics.utils.MetricType;

import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;

/**
 * This file is modified from io.micrometer.core.instrument.binder.jvm.ClassLoaderMetrics
 */
public class JvmClassLoaderMetrics implements IMetricSet {
    @Override
    public void bindTo(AbstractMetricService metricService) {
        ClassLoadingMXBean classLoadingBean = ManagementFactory.getClassLoadingMXBean();
        metricService.createAutoGauge(
                "jvm_classes_loaded_classes",
                MetricLevel.IMPORTANT,
                classLoadingBean,
                ClassLoadingMXBean::getLoadedClassCount);
        metricService.createAutoGauge(
                "jvm_classes_unloaded_classes",
                MetricLevel.IMPORTANT,
                classLoadingBean,
                ClassLoadingMXBean::getUnloadedClassCount);
    }

    @Override
    public void unbindFrom(AbstractMetricService metricService) {
        metricService.remove(MetricType.AUTO_GAUGE, "jvm_classes_loaded_classes");
        metricService.remove(MetricType.AUTO_GAUGE, "jvm_classes_unloaded_classes");
    }
}
